The Florida Today article On second flight, SpaceX Falcon 9 rocket to launch 'brute' of a satellite from Cape describes the upcoming SpaceX launch of SES-12. Next to this tiny image of (presumably) SES-12 is the caption:
SES-12 is the largest and most powerful all-electric propulsion communications satellite ever produced, according to manufacturer Airbus Defense and Space. The satellite's launch from Cape Canaveral on a SpaceX Falcon 9 rocket is targeted for 12:29 a.m. Friday, June 1.
The main text of the article also says:
According to Airbus, the satellite is the biggest and most powerful yet to rely entirely on electric propulsion to reach and hold its final orbit high over the equator.
Are they talking about the power output of the solar array, or total RF power transmitted, or power used for the all-electric propulsion, or even the total thrust available ("powerful thrusters")?
Related (though not all-electric propulsion): ViaSat's 18 kW solar array - largest ever for a commercial telecom satellite?